Weather
Oregon November Weather Nov. 5-11: Cascade Snow Threat Looms?
Salem, OR – Oregon's mountain highways are entering a time of year when rain in the valleys can turn into snow and ice at higher elevations. As November begins, travelers crossing the Cascades have re
By Avery Collins · 2026-10-29T07:32:05.793Z
Salem, OR – Oregon's mountain highways are entering a time of year when rain in the valleys can turn into snow and ice at higher elevations. As November begins, travelers crossing the Cascades have reason to monitor changing forecasts, even if conditions remain relatively mild in Portland, Salem and Eugene.
The concern is especially relevant along major east west routes that connect western Oregon with communities east of the mountains.
According to the National Oceanic and Atmospheric Administration's Climate Prediction Center, outlooks issued Wednesday, Oct. 28, cover Thursday, Nov. 5, through Wednesday, Nov. 11, and identify a limited heavy snow hazard area in the Pacific Northwest.
That regional outlook does not establish that Oregon's Cascade passes will receive heavy snow or confirm a specific winter storm during the period.
Where Mountain Snow Matters Most
U.S. Highway 26 near Government Camp and Mount Hood is among Oregon's most recognizable mountain travel corridors.
Santiam Pass on U.S. Highway 20 and Willamette Pass on Highway 58 are also exposed to winter conditions when cold air and Pacific moisture arrive together.
Snow levels can change substantially during autumn weather systems, creating rain at lower elevations while higher roadways experience accumulating snow.
A Different Picture Across Oregon
Portland, Salem, Eugene and much of the Willamette Valley typically experience rain more often than snow during early November.
Along the coast, communities including Astoria, Newport and Coos Bay generally remain milder because of the Pacific Ocean's influence.
Central and eastern Oregon, including Bend, Redmond, La Grande and Baker City, can experience freezing temperatures and early season snow, although local conditions depend on individual weather systems.
For travelers, the key question is whether freezing temperatures and precipitation will overlap at mountain pass elevations.
The available NOAA guidance does not provide snowfall totals, road closure predictions or precise timing for individual Oregon highways.
Residents and visitors should monitor National Weather Service forecasts and Oregon Department of Transportation road reports before mountain travel.
The Cascades remain a credible early November snow concern, but specific impacts for Nov. 5 11 are not yet confirmed.